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No Further Action Required (NFAR) Report <br /> ARROYO'S SMOG SHOP <br /> 3012 East Waterloo Road, Stockton, California <br /> TABLE OF CONTENTS <br /> SECTION PAGE <br /> 1.0. INTRODUCTION. . . . . . . . . . . . . . . . . . . a . . . . . . ..... . . . . . . . . . . . . . . . . . . . . 1 <br /> 2.0. BACKGROUND.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 <br /> 2.1. REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING. . . . . . . . . . . . . 1 <br /> 2.2. UNDERGROUND STORAGE TANK REMOVAL. . . . . . . . . . . . . . . . . . . 2 <br /> 2.3. SITE INVESTIGATIONS.. . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 <br /> 2.4. . GROUNDWATER MONITORING PROGRAM. . . . . . . . . . . . . . . . . . . . . 3 <br /> j 2.4.1. Groundwater Levels. . . . . . . . . . . . . . . 3 <br /> 2.4.2. Groundwater Flow Direction and Gradient. . . . . . . . . . . . . . . . . . . 4 <br /> 2.4.3. Dissolved Petroleum,Hydrocarbon Concentrations. . . . . . . . . . . . 4 <br /> 2.5. STRATIGRAPHY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 <br /> 3.0. SENSITIVE RECEPTOR SURVEY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 <br /> 4.0. ASSESSMENT OF HYDROCARBON-IMPACTED SOIL. . . . . . . . . . . . . . . . . . 5 <br /> 4.1. DISTRIBUTION OF PETROLEUM HYDROCARBON IMPACTED <br /> SOIL. . . . . . . . . . . . . . . . . . . . 5 <br /> 4.2. MASS OF REMAINING ADSORBED PETROLEUM <br /> HYDROCARBONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 <br /> 4.3. EVALUATION OF ENVIRONMENTAL SCREENING LEVELS.. . . . . . . . 6 <br /> 5.0. ASSESSMENT OF HYDROCARBON-IMPACTED GROUNDWATER. . . . . . . . 7 <br /> 6.0. RISK ASSESSMENT SOIL VAPOR INTRUSION EVALUATION.. . . . . . . . . . 8 <br /> 7.0. DISCUSSION AND CONCLUSIONS.. . . . . . . . . . . . . : . . . . . . . . . . . . . . . . . . . 8 <br /> 8.0. RECOMMENDATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 <br /> 9.0. LIMITATIONS. . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 <br /> Advanced GeoEnvironmental,Inc. <br />